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crypto.go
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crypto.go
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package integration
import (
"encoding/hex"
"fmt"
"net/url"
"github.com/btcsuite/btcd/btcec"
)
type SignedMessage struct {
K1 string
Sig string
Key string
}
// simulate a k1 signing
func signMessage(k1 string) (params SignedMessage, err error) {
// sign the message with a pre-defined private key
pkBytes, err := hex.DecodeString("22a47fa09a223f2aa079edf85a7c2d4f87" +
"20ee63e502ee2869afab7de234b80c")
if err != nil {
fmt.Println(err)
return
}
privKey, pubKey := btcec.PrivKeyFromBytes(btcec.S256(), pkBytes)
decodedChallenge, err := hex.DecodeString(k1)
if err != nil {
return params, err
}
sig, err := privKey.Sign(decodedChallenge)
if err != nil {
return params, err
}
return SignedMessage{
K1: k1,
Sig: hex.EncodeToString(sig.Serialize()),
Key: hex.EncodeToString(pubKey.SerializeCompressed()),
}, nil
}
func SignCallbackUrl(rawCallbackUrl string) (res string, err error) {
callbackUrl, err := url.Parse(rawCallbackUrl)
if err != nil {
return res, err
}
challenge := callbackUrl.Query().Get("k1")
signedMessage, err := signMessage(challenge)
if err != nil {
return res, err
}
// add query params
q := callbackUrl.Query()
q.Set("sig", signedMessage.Sig)
q.Set("key", signedMessage.Key)
// mutate callback url w/ new params
callbackUrl.RawQuery = q.Encode()
return callbackUrl.String(), nil
}